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MAYEUL BERNABE, OF TOULON, FRANCE. Letters Patent No. 61,143, datedJanuary 15, 1867 IMPROVED MODE OF PROTECTING ARMOR PLATES.

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TO WHOM IT MAY CONCERN:

Be it knownthat I, MAYEUL BERNABE, of Toulon, in the empire of France,have invented a new or improved process or method of treating ArmorPlates and other metallic articles, to render them inoxidizable; ofwhich I hereby declare the following to be a full, clear, and exactdescription.

This process or method is based upon the employment ofelectro'metallurgy applied to cover the steel,irou, or cast-iron plateswith an insulating'and protective coating of copper, the efl'ect ofwhich, when so produced, is by a peculiar action of neutralization ofthe electric currents to render the plates quite inoxidizabl. It is theemployment and application to armor plates and to other metallicarticles of this process with the view of protecting them, whichform'the subject of this invention. I proceed as follows:

The plates are shaped, perforated, and prepared for putting togetherbefore being submitted to the three following operations. The firstoperation is the cleaning. The plates are immersed in a vesselcontaining a suitable acid liquid. The second operation is the coatingwith copperby the galvanic process. The cleaned plates are placed in abath made alkaline by cyanide of potassium. The vessel containing thebath is by preference stoneware. In the interior is a plate of copper,facing, and of the same dimensions as, the armor or other plate. The twoconducting wires of a galvanic pile are placed, one in connection withthe copper and the other with the armor plate, and an electric currentis thereby established which causes a deposit of copper upon the armorplate; in a few hours the layer deposited is sufliciently thick toinsulate or separate the iron. The third operation consists instrengthening or increasing the first layer of copper which covers thearmor plate, by submitting the plate to a second galvanic coppering. Forthis purpose the plate already coated with copper is immersed in an acidbath of sulphate of copper, a plate of copper of the same dimensionsbeing'placed opposite the armor plate.- The bath is contained in awooden vessel, and is also traversed by an electric current from a pile.The plates should be left in this bath for from one to two days, whenthe coating of copper will be sufficientlythick. This process isapplicable for'insulatingi or protecting armor or other plates orarticles before or after their formation or completed execution.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, -is

The herein-described method or process of covering the steel, iron, orcast-iron plates with an insulating and protective coating of copper forneutralizing the electric currents and rendering the platesinoxidizable.

In testimony whereof I have signed my name to this specification beforetwo subscribing witnesses.

M. BERNABE. Witnesses:

F. Sncnnrnnr, L. Gsvorri

